For all of You who think that mobile phones won't do any harm:
I had a flight on an A320 from Moscow to Vienna a few years ago enrouete at FL 350 when suddenly the Primary Flight Display got weird, switching from Flight to "Specific Ground Indications" showing max sidestick deflections and back every second; after half a minute or so we got an additional ECAM warning about an EIU fault, with maybe Reverser deployment inflight.
At this time I made an immediate announcment requesting ALL electronic equipment to be turned off immediately. After 10 seconds all was fine again.
Even if Mr. Niki Lauda publicly announced that there can't be any influence by phones becaues he left two of them on in the cockpit (during landing !!!!), he doesn't convince me. Especially if You know that he has a contract with a mobile phone network that pays him US$ 290,000.- per year for ads.